{"id":13855,"date":"2026-10-24T11:00:38","date_gmt":"2026-10-24T07:30:38","guid":{"rendered":"https:\/\/www.pega.ir\/?p=13855"},"modified":"2026-10-24T11:08:03","modified_gmt":"2026-10-24T07:38:03","slug":"geomembrane-seam-quality-control","status":"publish","type":"post","link":"https:\/\/www.pega.ir\/?p=13855&lang=en","title":{"rendered":"Geomembrane Seam Quality Control: Tests and Project Handover Records"},"content":{"rendered":"

Quality control guide | For installers, inspectors and project owners<\/p>

A uniform seam appearance alone is insufficient for accepting a geomembrane weld.<\/strong> Traceable handover requires a test plan, seam identification, inspection results and resolution of repairs. This guide explains the control structure and handover records; equipment settings and acceptance criteria must follow the product, welding method and approved project specifications.<\/p>

1. Define the test plan before work starts<\/h2>

At the preconstruction meeting, assign responsibility for testing and approval, define how results are recorded and establish how nonconformities will be handled. Review sample forms before welding starts. Product specifications, roll numbers and panel layouts must be reconcilable with site records. Establish clear procedures for stoppages, restarts and changes in installation conditions.<\/p>

\"Extrusion
Close view of a connection: the test method must suit the seam type and quality plan. Image from PEGA\u2019s media collection.<\/figcaption><\/figure>

2. Quality control and quality assurance have different roles<\/h2>

Construction quality control, or CQC, is generally within the installer\u2019s responsibility. Construction quality assurance, or CQA, checks conformity with drawings and specifications and is often performed by an independent party. Define both roles in the contract. An inspector\u2019s presence does not remove the installer\u2019s obligation to record and correct the work; an installer\u2019s report does not replace the review required by the quality assurance plan.<\/p>

3. What do seam tests examine?<\/h2>
Control group<\/th>General purpose<\/th>Important limitation<\/th><\/tr><\/thead>
Visual inspection<\/td>Identify discontinuities and visible defects<\/td>Insufficient on its own for acceptance<\/td><\/tr>
Nondestructive testing<\/td>Check seam continuity using a suitable method<\/td>The method must suit the seam and project conditions<\/td><\/tr>
Destructive testing<\/td>Assess joint properties in a removed sample<\/td>The sampling location must be repaired and tested under the approved procedure<\/td><\/tr>
Repair verification<\/td>Record repairs and retest results<\/td>Each repair must link to the original seam and location<\/td><\/tr><\/tbody><\/table>

Air pressure testing of dual-track seams with an air channel and vacuum box testing of extrusion welds are common methods. Destructive tests can assess seam shear and peel strength. Do not apply one generic value for test selection, sampling intervals, pressure, duration or acceptance limits to every product and project.<\/p>

4. Every seam needs an identifier<\/h2>

A test report should allow the seam location to be found on the drawing. Link seam identification, adjacent panels, date and time, operator, equipment, recorded environmental conditions and test results in one traceable chain. If a seam was completed in several stages, show the working and stoppage intervals.<\/p>